[Android] Stop emitting a nonzero value from the test runner if a device goes offline.

[Android] Stop emitting a nonzero value from the test runner if a device goes offline.

Recipes interprets all nonzero exit codes as errors.

BUG=424587
Committed: https://crrev.com/0b8a046803444e8f2ba4cfefcee6152cbaadbfd7
Cr-Commit-Position: refs/heads/master@{#300614}

[jbudorick, 2014-10-21 23:15:13]

jbudorick@chromium.org changed reviewers:
+ klundberg@chromium.org, navabi@chromium.org

[luqui1, 2014-10-21 23:45:26]

luqui@google.com changed reviewers:
+ luqui@google.com

[luqui1, 2014-10-21 23:45:27]

lgtm

[jbudorick, 2014-10-21 23:47:16]

The CQ bit was checked by jbudorick@chromium.org

[commit-bot: I haz the power, 2014-10-21 23:50:42]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/651833004/1

[commit-bot: I haz the power, 2014-10-22 01:56:11]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-22 04:05:16]

Patchset 1 (id:??) landed as
https://crrev.com/0b8a046803444e8f2ba4cfefcee6152cbaadbfd7
Cr-Commit-Position: refs/heads/master@{#300614}